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    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting
    6.
    发明授权
    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting 失效
    用于连接到具有可编程限流的DC保持电路的电话线路的数字接入配置电路和方法

    公开(公告)号：US06498825B1

    公开(公告)日：2002-12-24

    申请号：US09098489

    申请日：1998-06-16

    申请人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    发明人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC分类号： H04B1500

    CPC分类号： H04L25/06 ,  H04L7/033 ,  H04L25/0266 ,  H04M11/06 ,  H04M19/001

    摘要： A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.

    摘要翻译： 可以使用数字直接访问布置（DAA）电路来终止在用户端的电话连接，其提供用于到达和来自电话线的信号的通信路径。 简要描述，DAA提供用于各种国际电话标准的DC终端的可编程装置。 本发明还可以用于在电容隔离屏障上传输和接收信号的装置。 更具体地，提供了一种DC可编程直流限流模式可用的直流保持电路。 在限流模式下，功率可能会在DAA集成电路外部的器件中耗散。 此外，大部分功率可能会在外部无源器件（如电阻）中消散。

    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants
    7.
    发明授权
    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants 有权
    用于连接到具有可切换时间常数的DC保持电路的电话线的数字接入配置电路和方法

    公开(公告)号：US07046755B2

    公开(公告)日：2006-05-16

    申请号：US10679046

    申请日：2003-10-03

    申请人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    发明人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC分类号： H04L23/00

    CPC分类号： H04L25/06 ,  H04L7/033 ,  H04L25/0266 ,  H04M11/06 ,  H04M19/001

    摘要： A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.

    摘要翻译： 可以使用数字直接访问布置（DAA）电路来终止在用户端的电话连接，其提供用于到达和来自电话线的信号的通信路径。 简要描述，DAA提供用于各种国际电话标准的DC终端的可编程装置。 本发明还可以用于在电容隔离屏障上传输和接收信号的装置。 更具体地，提供了一种DC可编程直流限流模式可用的直流保持电路。 在限流模式下，功率可能会在DAA集成电路外部的器件中耗散。 此外，大部分功率可能会在外部无源器件（如电阻）中消散。

    Digital isolation system with low power mode
    8.
    发明授权
    Digital isolation system with low power mode 失效
    低功耗模式的数字隔离系统

    公开(公告)号：US06442271B1

    公开(公告)日：2002-08-27

    申请号：US09034621

    申请日：1998-03-04

    申请人： George Tyson Tuttle ,  Jerrell P. Hein ,  Timothy J. Dupuis ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    发明人： George Tyson Tuttle ,  Jerrell P. Hein ,  Timothy J. Dupuis ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC分类号： H04M100

    CPC分类号： H04L25/06 ,  H04L7/033 ,  H04L25/0266 ,  H04M1/573 ,  H04M11/06 ,  H04M19/001 ,  H04M19/02

    摘要： A method and apparatus are provided for maintaining communication across an isolation barrier even if the external circuitry to which it is connected enters a low-power mode. In normal operation the isolation barrier local clock is synchronized with a clock signal provided by the external circuitry. If the external circuitry enters a low-power mode, its clock signal often slows or stops. In that case, the local clock in the isolation barrier switches to a free-running mode, wherein a VCO voltage input is provided by a bias voltage generator instead of by a PLL circuit. The VCO thus continues to provide a local clock signal in order to allow communication of information across the isolation barrier even if the external circuitry is not active. This enables the isolation barrier to receive and process an external signal, such as a ring signal, in low-power mode. Means are provided for causing the external circuitry to “wake up” in the event that a ring or other signal is detected by the isolation system, at which time the system resumes normal operation.

    摘要翻译： 提供了一种用于在隔离屏障上保持通信的方法和装置，即使其所连接的外部电路进入低功率模式。 在正常操作中，隔离栅本地时钟与由外部电路提供的时钟信号同步。 如果外部电路进入低功耗模式，则其时钟信号通常会减慢或停止。 在这种情况下，隔离栅中的本地时钟切换到自由运行模式，其中VCO电压输入由偏置电压发生器而不是由PLL电路提供。 因此，VCO因此继续提供本地时钟信号，以便即使外部电路不活动，也可以跨隔离屏障通信信息。 这使得隔离屏障能够在低功率模式下接收和处理外部信号，例如振铃信号。 提供了在隔离系统检测到环或其他信号的情况下使外部电路“唤醒”的装置，此时系统恢复正常操作。

    Call progress monitor circuitry and method for a communication system
    9.
    发明授权
    Call progress monitor circuitry and method for a communication system 失效
    呼叫通信系统的进度监视电路和方法

    公开(公告)号：US06389134B1

    公开(公告)日：2002-05-14

    申请号：US09035779

    申请日：1998-03-04

    申请人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    发明人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC分类号： H04M100

    CPC分类号： H04L25/06 ,  H04L7/033 ,  H04L25/0266 ,  H04M1/573 ,  H04M11/06 ,  H04M19/001 ,  H04M19/02

    摘要： A call progress monitor circuit is disclosed for a digital DAA in which digital information is transmitted across an isolation barrier from phone line side circuitry to powered side circuitry. In particular, the call progress monitor circuit of the present invention converts oversampled digital transmit and receive data into analog transmit and receive signals and then combines them to produce a call progress signal that is provided to be fed to a speaker driver circuit. In addition, the call progress signal in one embodiment is filtered with a low pass filter. The call progress monitor circuit in one embodiment includes oversampled digital-to-analog converters, a summing circuit, and a low pass filter. Corresponding methods for monitoring the progress of a call utilizing oversampled digital transmit and receive signals are also disclosed.

    摘要翻译： 公开了一种用于数字DAA的呼叫进程监视电路，其中数字信息通过隔离屏障从电话线侧电路传输到电源侧电路。 特别地，本发明的呼叫进程监视电路将过采样的数字发送和接收数据转换为模拟发送和接收信号，然后将它们组合以产生提供给馈送到扬声器驱动器电路的呼叫进行信号。 此外，一个实施例中的呼叫进程信号用低通滤波器滤波。 一个实施例中的呼叫进程监视电路包括过采样的数模转换器，加法电路和低通滤波器。 还公开了用于监视利用过采样数字发射和接收信号的呼叫进展的相应方法。

    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting
    10.
    发明授权
    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting 失效
    用于连接到具有可编程限流的DC保持电路的电话线路的数字接入配置电路和方法

    公开(公告)号：US07515672B2

    公开(公告)日：2009-04-07

    申请号：US10679013

    申请日：2003-10-03

    申请人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    发明人： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC分类号： H04L23/00

    CPC分类号： H04L25/06 ,  H04L7/033 ,  H04L25/0266 ,  H04M11/06 ,  H04M19/001

    摘要： A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable circuit for the DC termination for a variety of international phone standards. The invention may also be utilized with circuitry for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.

    摘要翻译： 可以使用数字直接访问布置（DAA）电路来终止在用户端的电话连接，其提供用于到达和来自电话线的信号的通信路径。 简要描述，DAA为各种国际电话标准的DC终端提供可编程电路。 本发明还可以用于跨电容隔离屏障发送和接收信号的电路。 更具体地，提供了一种DC可编程直流限流模式可用的直流保持电路。 在限流模式下，功率可能会在DAA集成电路外部的器件中耗散。 此外，大部分功率可能会在外部无源器件（如电阻）中消散。